Hydraulic rotary-drill bit



Patented Nov. 5, 1929 UNITED STATES PATENT OFFICE CHARLES L. HABRALSON, OF CASPER, WYOMING, ASSIGNOR, BY MESNE ASSIGNMENTS, OF FORTY-SEVEN AND ONE-HALF PER CENT TO THE LEIDECKEB TOOL COMPANY, OF MABIETTA, OHIO, A CORPORATION OF OHIO innmunc ROTARY-DRILL BI'I.

Application filed August 9, 1924, Serial No. 731,010.

My invention relates to hydraulic rotary drill bits; and the object is to provlde 1mprovements on the drill bits shown in my application for a patent for drill blLS, filed Aug. 28, 1922, Ser. No. 584,917, and the mprovements include means for supplying water at or very near the bottom of the drill bits and further these improvements are particularly for use in auger rotary drill bits and the advantage is that the holes or wells are drilled straight by reason of the uniformity in the radial projection of the blades and the ossibility of making long bits and thls can e done by reason of supplying water to the bottom of the hits at the cutting points. Other objects and advantages will be fully explained in the following description and the invention will be more particularly pointed out in the claims.

Reference is had to the accompanying drawings which form a part of this application.

Fig. 1 is a side elevation of the improved bit, showing the means for suppl ing water. Fig. 2 is a bottom plan view 0 the same. Fig. 3 is a side elevation of the bit, showing a variation in the design. Fig. 4 is a horizontal section of the same, taken on the line 44 of Fig. 3.

Similar characters of reference are used to indicate the same parts throughout the several views.

The bit is provided with the usual connection 1 and shank 2. The bit is provided with spiral blades 3 which are beveled one way at the lower edge, indicated at 4. The blades are formed on a cylindrical core 7 and made in the form of a'maltese cross, being thicker at the outer edges than at the junction with the core. This gives the greater thickness at the outer edges which do the greater part of the work. The blades may be made six feet in length and the sizes of the bits may vary from six hundred pounds to eighteen hundred pounds more or less and vary in length as well as diameter as may be required.

The water is supplied through a duct formed in the connection 1 and the shank 2 and centrall into the upper part of the body of the bit. penings are then tapped into the to the metal of the blades and on the back central opening 5 for connecting water distribution pipes or tubes 6. The pipes or tubes 6 are inserted in the openings and extended down between each pair of blades and brazed side of the blades. The tubes 6 are protected because the bits are rotated in one direction only while drillin Water is continually supplied during rilling under hydraulic pressure which maybe above or below .two thousand pounds pressure. The terminals of the blades at the bottom are of greater re dius than the main body of the blades so that there will be no friction on the body of the blades.

The variation shown in Figs. 3 and 4 consists principally in variation of design in the fish-tail or paddle bit. The blades are beveled at the lower edges and the terminals at the bottom are of greater radius than the body of bit, as in the'previously described blades. Water is supplied in the same manner. Various changes in the sizes, proportions, construction and arrangement may be made without departing from my invention.

The discharge of water under hydraulic pressure on the terminals of the blades will keep the blades cool and also keep the mud cleaned from the blades and also keep fresh surface below the blades and the hydraulic pressure on the water will make the water out the earth, co-operating with the blades.

What I claim, is,-

1. A drill bit having more than two inte- "gral blades, the adjacent blades having the sides thereof extending at acute angles to each other to 'form channels between the blades, a water tube positioned and entirely enclosed in each of said channels and being secured to a side of the blade adjacent the rear face thereof, and extending substantially to the cutting end of the blade, and a central Water duct communicating with the tubes for supplying Water under pressure thereto.

2. A drill bit having a plurality of radial blades having the sides thereof extending at acute angles to each other to form channels between the blades, a water tube positioned and entirely enclosed in each of said channels and being secured to and extending along a side of the blade adjacentthe rear face 100 thereof substantially to the cutting end of the blade, and a central water duct terminating in a plurality of laterally arranged ducts connected with the water tubes for supplying water under ressure thereto.

A. drill it having a glurality of radial blades formed thereon an having the sides thereof extending at acute angles to each other to form channels between the blades, 1 and water tubes positioned and entirely enclosed in said channels and extending approximately throughout the length thereof to the cutting end said tubes extending along the sides of the blades adjacent the rear face thereof. i A

4. A drill b1t havmg a plurallty of radlal blades formed thereon and having the sides thereof extending at an les to each other to form channels between t e blades, and a water tubepositioned and entirely enclosed in at least one of said channels, and extending toward the cutting end, said tube extending along the blade on the rear face thereof.-

In testimony whereof, I set my hand, this 22nd day of September, 1923.

CHARLES L. HARRALSON. 

